Assessment of dead-end ultrafiltration for the detection and quantification of microbial indicators and pathogens in the drinking water treatment processes
| Autor: | Pere Emiliano, R. Araujo, Cristina Dacal-Rodríguez, Miriam Pascual-Benito, Francisco Lucena, Mercedes Gracenea, Fernando Valero, Cristina García-Aljaro, Raquel Casas-Mangas |
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| Rok vydání: | 2020 |
| Předmět: |
Ultrafiltration
Water supply Cryptosporidiosis Cryptosporidium 010501 environmental sciences 01 natural sciences Enteroviruses Water Purification 03 medical and health sciences Human health 0302 clinical medicine Dead end Water Supply Drinking water Humans 030212 general & internal medicine Enterovirus 0105 earth and related environmental sciences Detection limit biology business.industry Drinking Water Public Health Environmental and Occupational Health biology.organism_classification Pulp and paper industry Aigua potable Water quality Environmental science Water treatment Qualitat de l'aigua business Water Microbiology |
| Zdroj: | International journal of hygiene and environmental health. 230 |
| ISSN: | 1618-131X |
| Popis: | A safe water supply requires distinct treatments and monitoring to guarantee the absence of pathogens and substances potentially hazardous for human health. In this study we assessed the efficiency of the dead-end ultrafiltration (DEUF) method to concentrate faecal indicator organisms (FIO) and pathogens in water samples with different physicochemical characteristics. Water samples were collected at the treatment stages of two drinking water treatment plants to analyse the concentration of a variety of 7 FIO and 4 reference microbes which have some species that are pathogenic to humans: Campylobacter spp., enteroviruses, Cryptosporidium spp. and Giardia spp. The samples were analysed before and after concentration by DEUF, detecting FIO concentrations about 1 log10 higher in non-concentrated samples from both catchments. Percent recoveries were highly variable with a mean of 43.8 ± 17.5%, depending on the FIO and inherent sample characteristics. However, DEUF enabled FIO concentration in high volumes of water (100–500 l), allowing a reduction in the detection limit compared to the non-concentrated samples due to the high volume processing capabilities of the method. As a consequence, the detection of FIO removal from water in the drinking water treatment process was 1.0–1.5 logarithms greater in DEUF-treated water compared to unfiltered samples. The DEUF method improved the detection of target indicators and allowed for the detection of pathogens in low concentrations in water after the treatment stages, confirming the suitability of DEUF to concentrate high volumes of different types of water. This method could be useful for microbial analysis in water treatment monitoring and risk assessment, allowing the identification of critical points during the water treatment process and potential hazards in water destined for several uses. |
| Databáze: | OpenAIRE |
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